Pauly Shore and Sean Austin find the cave man and he is a big block of ice. They put him out in the garage to melt with several heaters around him and then go to school. Nobody else is shown to be at home and nobody else knows about the caveman. The cave man melts and gets out of the big block of ice. When Pauly and Sean get home from school, they go to check on him and all the heaters have been turned off. Throughout the movie, the cave man is portrayed to be unintelligent so he wouldn't have known to turn off the heaters. So who did? Inconsistency!